Improvement



F. M. DUN`BAR, NELLIE STUWLL & E. M. DUNBAR. Gas-Governr.

N()` 163,16@ Patented M2M/11,1875.

FRANCIS M. DUNBAR, NELLIE STOWELL, AND EUGENE M. DUNBAR, OF KALAMAZOO, MICHIGAN.

IMPROVEMENT IN GAS-GOVERNORS.

Speciication forming part of Letters Patent No. 163J66, dated May 11, 1875; application filed March 20, 1875.

To all whom t may concern:

Be it known that we, FRANCIS M. DUNBAR, NELLIE SrowELL, and EUGENE M. DUNBAR, all of Kalamazoo, in the county of Kalamazoo and State of Michigan, have invented a new and valuable Improvement in Gas7Governors; and we do hereby declare that the following is a full, clear, and exact description ofthe construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and gures of reference marked thereon.

Figure l ofthe drawings is a representation ot' a sectional view of our gas-governor, and Figs. 2 and 3 are plan views of the same.

Uur invention has relation to check-valve governorsV for automatically regulating the tlow of illuminating-gas to the burners; and the nature of our invention consists in com bining a spring-valve with a pipe-section having a conical bore, asl will be hereinafter eX- plained.

In the annexed drawings, A designates a pipe-section or cylindrical box having a nutenlargement on one end and a screw-thread on the other end. This short section A is adapted to connect together two pipe-sections. The bore of the section A is made tapering, andthe tapering portion terminates at both ends in screw-threaded sockets, in the lower one of which a ring, D, is screwed, and in the upper one a ring, G, is screwed. A bridge7 a, ot' ring G, receives through it a valve-stem, C, on which is a valve, B, and a bridge, E, of ring D, receives through it the lower portion of the stem C. The valve-stein is thus prop erly guided, and the valve B is allowed to rise and descend freely, and to seat itself upon the ring D at the largest end of the upwardly-tapered bore. Between the valve B and the ring G is a spring, S, which is coiled around the upper portion ofthe valvestem, and which holds the valve down uponits seat. We have. represented another spring, S', below the valve; but we do not deem this spring necessary, and when spring S is used We shall omit it, or, if spring S is used, spring S will be omitted. To prevent valve B from rising too high and entirely shutting ottl the gas, a slight enlargement, c, is made on the valve-stem C, which will strike ring G just before the periphery of valve B touches the walls of the tapered bore of section A.

It will be seen from the above description that the higher the valve B is raised by the pressure of gas beneath it the smaller will be the space for the passage. As the gas-pressure diminishes the spring S forces the valve B toward its seat, and thus increases the space for the passage otl the gas. By these means we secure an even pressure ot' gas at the burn ers, and prevent blowing and dickeringi It is obvious that by the use of the spring or springs the governor can be in any desired position.

What we claim as new, and desire to secure by Letters Patent, is

The screw-threaded pipe-section A, having 

